|Ab urbe condita||1615|
|Balinese saka calendar||783–784|
|Chinese calendar||辛巳年 (Metal Snake)|
3558 or 3498
— to —
壬午年 (Water Horse)
3559 or 3499
|- Vikram Samvat||918–919|
|- Shaka Samvat||783–784|
|- Kali Yuga||3962–3963|
|Japanese calendar||Jōgan 4|
|Minguo calendar||1050 before ROC|
|Seleucid era||1173/1174 AG|
|Thai solar calendar||1404–1405|
988 or 607 or −165
— to —
989 or 608 or −164
- The Varangians (called Rus'), under the leadership of Rurik, a Viking chieftain, arrive (with his brothers, Sineus and Truvor) at Staraya Ladoga. He builds a trade settlement near Novgorod (modern Russia), and founds the Rurik Dynasty.
- King Lothair II of Lotharingia tries to divorce his wife Teutberga, on trumped-up charges of incest. With the support of his brother, Louis II, the bishops give him permission to remarry during a synod at Aachen.
- March – Viking raiders led by Weland are trapped at Trilbardou Bridge (Northern France), and submit to King Charles the Bald. He and his family accept Christianity (they are baptised) before leaving Neustria.
- Robert the Strong, margrave of Neustria, captures 12 Viking ships and kills their crews. He pays tribute (Danegeld) for keeping the Vikings out of Neustria.
- Carloman, eldest son of King Louis the German, revolts against his father. He is captured, but manages to escape to the Ostmark (or 861).
- First raid of the Hungarians in the Carpathian Basin at the request of Rastislav of Moravia against the East Frankish Kingdom.
- The first written record (according to the Primary Chronicle) is made of the towns of Belozersk and Murom (Northern Russia).
- Viking forces sack Cologne.
- April 13 – King Donald I of Scotland dies after a 4-year reign. He is succeeded by his nephew Constantine I, as ruler of Scotland.
- Áed Findliath is crowned High King of Ireland, after the death of Máel Sechnaill mac Maíl Ruanaid (until 879).
- June – Caliph al-Muntasir dies after just a half-year reign. He is succeeded by al-Musta'in (son of prince Muhammad), as ruler of the Abbasid Caliphate.
- Ashot I ("the Great") is recognized as the 'Prince of Princes' of Armenia, by the Abbasids.
- June 8 – Xi Zong, emperor of the Tang Dynasty (d. 888)
- Li Cunxin, general of the Tang Dynasty (d. 902)
- Li Cunshen, general of Later Tang (d. 924)
- Wang Chuzhi, Chinese warlord (d. 922)
- Wang Shenzhi, founder of Min (Ten Kingdoms) (d. 925)
- Xiao Qing, chancellor of Later Liang (d. 930)
- Xu Wen, general and regent of Wu (d. 927)
- Yúnmén Wényǎn, Chinese Zen master (or 864)
- Zhou Ben, general of Wu (d. 938)
- April 13 – Donald I, king of Scotland (b. 812)
- July 2 – Swithun, bishop of Winchester
- September 26 – Musa ibn Musa al-Qasawi, Muslim military leader (b. c. 790)
- Æthelred II, king of Northumbria
- Al-Muntasir, Muslim caliph (b. 837)
- Bugha al-Kabir, Muslim general
- Lupus Servatus, Frankish abbot (approximate date)
- Máel Sechnaill mac Maíl Ruanaid, High King of Ireland
- Ruarc mac Brain, king of Leinster (Ireland)
- Tahir ibn Abdallah, Muslim governor